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Horses prepare for Kentucky Derby

John Sommers II | ReutersKentucky Derby hopeful Liaison is washed down by his grooms after galloping on the track during early morning workouts at Churchill Downs in Louisville, Ky., May 4, 2012.Request to buy this photo

John Sommers II | ReutersKentucky Derby hopeful Dullahan gallops on the track with his exercise rider during early morning workouts at Churchill Downs in Louisville, Ky., May 4, 2012.Request to buy this photo

John Sommers II | ReutersKentucky Derby hopeful Liaison (L) walks off the track with his exercise rider after galloping during early morning workouts at Churchill Downs in Louisville, Ky., May 4, 2012.Request to buy this photo

John Sommers II | ReutersKentucky Derby hopeful Union Rags walks in the barn with his exercise rider after galloping during early morning workouts at Churchill Downs in Louisville, Ky., May 4, 2012.Request to buy this photo

Matt Sullivan | ReutersKentucky Derby hopeful Creative Cause (L) is led onto the track by his exercise rider during early morning workouts at Churchill Downs in Louisville, Ky., May 4, 2012.Request to buy this photo

Matt Sullivan | ReutersKentucky Derby hopeful Done Talking gallops on the track with his exercise rider during early morning workouts at Churchill Downs in Louisville, Ky., May 4, 2012.Request to buy this photo

Matt Sullivan | ReutersKentucky Derby hopeful Daddy Long Legs gallops on the track with his exercise rider during early morning workouts at Churchill Downs in Louisville, Ky., May 4, 2012.Request to buy this photo

John Sommers II | ReutersThe barn area at Churchill Downs is seen as a horseman prepares his horse for the 138th running of the Kentucky Derby during early morning workouts at Churchill Downs in Louisville, Ky., May 4, 2012.Request to buy this photo

Matt Sullivan | ReutersKentucky Derby hopeful Went the Day Well gallops on the track with his exercise rider during early morning workouts at Churchill Downs in Louisville, Ky., May 4, 2012.Request to buy this photo

John Sommers II | ReutersKentucky Derby hopeful Dullahan walks on the track with his exercise rider during early morning workouts at Churchill Downs in Louisville, Ky., April 30, 2012.Request to buy this photo

John Sommers II | ReutersKentucky Derby hopeful Union Rags grazes in the barn area after galloping on the track during early morning workouts at Churchill Downs in Louisville, Ky., April 30, 2012.Request to buy this photo

John Sommers II | ReutersKentucky Derby hopeful Rousing Sermon walks in the barn before going to the track to gallop during early morning workouts at Churchill Downs in Louisville, Ky., April 30, 2012.Request to buy this photo

John Sommers II | ReutersKentucky Derby hopeful Creative Cause is washed down by his grooms in the barn area after an early morning workout at Churchill Downs in Louisville, Ky., April 30, 2012.Request to buy this photo

John Sommers II | ReutersKentucky Derby hopeful Trinniberg gallops on the track with jockey Willie Martinez during an early morning workout at Churchill Downs in Louisville, Ky., April 30, 2012.Request to buy this photo

John Sommers II | ReutersKentucky Derby hopeful Prospective gallops on the track with his exercise rider during early morning workouts at Churchill Downs in Louisville, Ky., April 30, 2012.Request to buy this photo

John Sommers II | ReutersKentucky Derby hopeful Liaison (L) gallops on the track with his exercise rider during early morning workouts at Churchill Downs in Louisville, Ky., April 30, 2012.Request to buy this photo

John Sommers II | ReutersKentucky Derby hopeful Union Rags is washed down by his grooms in the barn area after galloping on the track during early morning workouts at Churchill Downs in Louisville, Ky., April 30, 2012.Request to buy this photo

John Sommers II | ReutersKentucky Derby hopeful Daddy Nose Best grazes with his groom after galloping on the track during early morning workouts at Churchill Downs in Louisville, Ky., April 30, 2012.Request to buy this photo